I have three of those security gates. Two of them have the keyed lock on both sides, but the third has the thumb latch. There's no way you could get your hand around it to unlock it from the outside, but the other two are more open. As much as I hate the look of them, they are pretty handy for when we go out of town.
1978 13BT-40, 70 series mechanicals
1966 FJ45 lwb stock
2003 100 OME lift
1974V8J40, 1992FJ80, 1985FJ60, 1971FJ55, 1978FJ40, 1974FJ40, 1997 LX450 all long gone.